Problem 1 on current electricity

[anshuiit]

Homework Statement

the problem is attached to this post

Homework Equations

Req=1/R1+1/R2+... for parallel and Req.=R1+R2+... for series... Kirchoff's law for Current and Potential to be applied

The Attempt at a Solution

completely lost ... pls help

 

[N-Gin]

First you need to find current and voltage across $R_{2}$ as a function of time. Then you can find the generated heat by using the formula

$$W_{2}=\int^{\infty}_{0}V_{2}(t)I_{2}(t)dt,$$

where $V_{2}$ and $I_{2}$ are the voltage and current across resistor $R_{2}$. As you see, time goes from 0 to infinity (when the capacitor is fully charged).

 

[anshuiit]

First you need to find current and voltage across $R_{2}$ as a function of time. Then you can find the generated heat by using the formula

$$W_{2}=\int^{\infty}_{0}V_{2}(t)I_{2}(t)dt,$$

where $V_{2}$ and $I_{2}$ are the voltage and current across resistor $R_{2}$. As you see, time goes from 0 to infinity (when the capacitor is fully charged).

can u give me the answer?

 

[N-Gin]

can u give me the answer?

It's against the policy! You need to show some effort first.